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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acegisecurity.intercept.method;

import org.acegisecurity.AccessDeniedException;
import org.acegisecurity.Authentication;
import org.acegisecurity.ConfigAttributeDefinition;

import org.acegisecurity.intercept.AbstractSecurityInterceptor;

import org.aopalliance.intercept.MethodInvocation;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.factory.InitializingBean;

import org.springframework.util.Assert;


/**
 * Allows users to determine whether they have "before invocation" privileges for a given method invocation.

Of * course, if an {@link org.acegisecurity.AfterInvocationManager} is used to authorize the result of a method * invocation, this class cannot assist determine whether or not the AfterInvocationManager will enable * access. Instead this class aims to allow applications to determine whether or not the current principal would be * allowed to at least attempt to invoke the method, irrespective of the "after" invocation handling.

* * @author Ben Alex * @version $Id: MethodInvocationPrivilegeEvaluator.java 1496 2006-05-23 13:38:33Z benalex $ */ public class MethodInvocationPrivilegeEvaluator implements InitializingBean { //~ Static fields/initializers ===================================================================================== protected static final Log logger = LogFactory.getLog(MethodInvocationPrivilegeEvaluator.class); //~ Instance fields ================================================================================================ private AbstractSecurityInterceptor securityInterceptor; //~ Methods ======================================================================================================== public void afterPropertiesSet() throws Exception { Assert.notNull(securityInterceptor, "SecurityInterceptor required"); } public boolean isAllowed(MethodInvocation mi, Authentication authentication) { Assert.notNull(mi, "MethodInvocation required"); Assert.notNull(mi.getMethod(), "MethodInvocation must provide a non-null getMethod()"); ConfigAttributeDefinition attrs = securityInterceptor.obtainObjectDefinitionSource().getAttributes(mi); if (attrs == null) { if (securityInterceptor.isRejectPublicInvocations()) { return false; } return true; } if ((authentication == null) || (authentication.getAuthorities() == null) || (authentication.getAuthorities().length == 0)) { return false; } try { securityInterceptor.getAccessDecisionManager().decide(authentication, mi, attrs); } catch (AccessDeniedException unauthorized) { if (logger.isDebugEnabled()) { logger.debug(mi.toString() + " denied for " + authentication.toString(), unauthorized); } return false; } return true; } public void setSecurityInterceptor(AbstractSecurityInterceptor securityInterceptor) { Assert.notNull(securityInterceptor, "AbstractSecurityInterceptor cannot be null"); Assert.isTrue(MethodInvocation.class.equals(securityInterceptor.getSecureObjectClass()), "AbstractSecurityInterceptor does not support MethodInvocations"); Assert.notNull(securityInterceptor.getAccessDecisionManager(), "AbstractSecurityInterceptor must provide a non-null AccessDecisionManager"); this.securityInterceptor = securityInterceptor; } }




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